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Plant Reproduction Lecture 1

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Stamens. Male reproductive structure. Carpels. Female reproductive structure. The Flower. Stamen. Filament. Anther. Pollen grains (male gametophyte) develop here ... – PowerPoint PPT presentation

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Title: Plant Reproduction Lecture 1


1
Plant Reproduction Lecture 1
  • Chapter 38

2
Review Three Kinds of Sexual Life Styles (1)
  • All organisms with a sexual life cycle have a
    haploid (n) and a diploid (2n) phase. This
    requires two processes
  • Fertilization Joining of gametes (n n gt 2n)
  • Followed by progression from the haploid (n) to
    diploid (2n) phase
  • Meiosis Production of haploid cells (gametes or
    spores) (n)
  • Followed by progression from the diploid (2n) to
    haploid (n) phase
  • Different organisms devote different percentages
    of their life to the adult stage (in either the
    haploid or diploid part of the cycle)

3
Review Three Kinds of Sexual Life Styles (2)
  • Haplontic Life Cycle or Haploid Life Cycle (Some
    Unicellular Algae (Protista) and Fungi)
  • Haploid Phase Mature multicellular adult
    organism
  • Diploid Phase The zygote is the only diploid
    cell!!
  • Alternation of Generations (Plants and Some
    Algae)
  • Haploid and Diploid phases are both multicellular
    adult organisms
  • Diplontic Life Cycle or Diploid Life Cycle
    (Animals)
  • Haploid Phase Gametes are the only haploid
    cells.
  • Diploid Phase Mature multicellular adult organism

4
Review Alternation of Generations Life Cycle-
Plants
  • All plant life cycles have an alternation of
    generations
  • Gametophyte (gamete producing plant)
  • A multicellular individual with haploid cells (n)
  • These haploid cells produce haploid gametes
    (through mitosis)
  • These haploid gametes fuse together through
    fertilization to form a diploid zygote that
    develop into a . . .
  • Sporophyte (spore producing plant)
  • A multicellular individual with diploid cells
    (2n)
  • These diploid multicellular organisms (2n)
    produce haploid spores (n) through meiosis.

5
Plants Different Approaches to Alternation of
Generations
  • Bryophytes
  • Non-vascular plants
  • Example Mosses
  • Seedless Vascular Plants
  • Example Ferns
  • Seed Plants
  • Gymnosperms (Naked seed plants- conifers, etc.)
  • Angiosperms (Flowering plants)

6
Angiosperms Life Cycle
  • Sporophyte (2n)
  • The plant we see
  • Gametophyte (n)
  • Inside the flower

7
The Flower What Makes an Angiosperm an Angiosperm
  • Idealized Flower
  • Four Floral Organs from outside to inside
  • Sepals
  • Generally green, look like leaves
  • Petals
  • Colorful, attract insects
  • Stamens
  • Male reproductive structure
  • Carpels
  • Female reproductive structure

8
The Flower
  • Stamen
  • Filament
  • Anther
  • Pollen grains (male gametophyte) develop here
  • Carpel
  • Stigma
  • Pollen grains land here
  • Style
  • Ovary
  • One or more ovules develop here
  • Inside the ovule is the female gametophyte which
    have egg containing embryo sacs
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